rtc: verify a critical argument to rtc_update_irq() before using it

This small addition to the core simplifies code in the drivers and makes
them more robust when handling shared IRQs.

Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alessandro Zummo 2014-04-03 14:50:09 -07:00 committed by Linus Torvalds
parent c93a3ae2d2
commit 131c9cc832

View File

@ -584,6 +584,9 @@ enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer)
void rtc_update_irq(struct rtc_device *rtc,
unsigned long num, unsigned long events)
{
if (unlikely(IS_ERR_OR_NULL(rtc)))
return;
pm_stay_awake(rtc->dev.parent);
schedule_work(&rtc->irqwork);
}